There are physiological and pathological causes of bone calcification. 1. Physiological reasons: physiological bone calcification is mostly seen in children, it is a physiological process in which inorganic salts are gradually deposited in bones and cartilage gradually develops into mature bones in the process of normal growth and development of children. 2. Pathological causes (1) Calcium salt deposition: the main components of calcium salt are calcium phosphate and calcium carbonate and a small amount of iron, magnesium and other substances. Calcium salt deposition in necrotic or necrotic tissues or foreign bodies is called dystrophic calcification. At this time, the body’s calcium and phosphorus metabolism is normal, seen in tuberculosis, thrombosis, atherosclerotic plaques, senile aortic valve lesions and scar tissue, etc. (2) Metastatic calcification: common in hyperparathyroidism, renal failure, excessive intake of vitamin D, etc. Certain bone tumors can also cause calcification; in addition, bone infarction can cause calcification in the bone marrow cavity. (3) Chronic injury: Long-term chronic strain injury can lead to small hemorrhages of muscles and tendons at the bone attachment points, and the tiny hemorrhages will slowly mechanize, ossify, and become bony, such as tibial osteophytes. (4) Calcification of cartilage: The parts of the body that are originally cartilage, such as thyroid cartilage and rib cartilage, etc., will be transformed into bone tissue due to calcification of calcium salts deposited in the blood as a result of increased calcium concentration in the blood caused by the action of parathyroid glands as a result of aging. Patients who find calcification of bone should consult the doctor in time to clarify the cause and get early treatment so as not to delay the condition and affect the prognosis.